Adjustable soundboard mounting



March 16, 1937. v} KORONCA] ET AL 2,973,747

ADJUSTABLE SOUNDBOARD MOUNTING Filed May 25, 1955 fzza-E INVENTOR. V/c TOR L. KORO/VCA! AUDOLPH 6. AOfiO/VCAZ i atented Mar. 16, 1937 UNITED STATES PATET OFFEQE Victor L. Koroncai and Rudolph S. Koroncai, Cleveland, Ohio Application May 25, 1935, Serial No. 23,506

8 Claims.

Our invention pertains to an adjustable soundboard mounting and more particularly to means for effecting a spatial adjustment of a sound ing board, exemplifiedly the sounding board and electrical mechanism carried thereby as commonly employed in radio sets.

The object of our invention is to improve the acoustical performance of an instrument from which sound is to emanate. Radio sets which are incorporated in a cabinet resting on the floor have had their sounding boards permanently adjusted to a predetermined position of inclination to suit their established elevation above the floor with respect to the approximate elevation of the ears of auditors seated within the same room, but it will be evident that radio sets which are intended to rest upon other pieces of furniture and at many diiierent elevations with respect to the floor cannot all have their sounding boards preadjusted to the most effective angle nor should they all be factory-given the same position of angular adjustment. Consequently, it is the purpose of our invention to eliminate such deficiency by provision of simple mechanical means permitting the owner variously to adjust the inclination of the sounding board and electrical sound rendition instruments carried thereby so as to achieve the best acoustical results.

Adverting to the drawing:-

Figure 1 is a vertical section through the upper front corner of a radio cabinet, showing interiorly thereof an inside elevation of the structure embodying our invention.

Figure 2 is an enlarged detailed view of a universal joint employed in our structure.

Figure 3 is an enlarged View on line 33 of Figure 1.

Figure 4 is a view on line 44 of Figure 1.

4 The radio cabinet comprises a top I and a front wall 2 provided as shown with an opening through which sound is to be emitted. A hinge 3 extends horizontally and is attached to the inner side of the front wall 2 below the opening 45 therein. Carried by the hinge El secured along its lower edge thereto is a sounding board 4 to the rear side of which is attached an element 5 which, in turn, carries centrally some standard type of loud speaker 6.

50 The upper edge of the sounding board 4 carries at its approximate middle point a forked bracket 1 through which extends a pin 8 to which is secured between the extensions of the fork a nut 9 which latter is consequently capable 55 of hinge action. A screw It? is in threaded connection with the nut 9 and such connection is preferably formed with a fast pitch. The front end of the screw i0 is fixed to a hub l! of a common type of universal joint which is articulated at E? with a companion hub l3 which latter is fashioned with a projecting shaft l4 which extends through the front Wall 2 and has fixed to its extremity a turning knob l5. As will be readily understood, a turning movement imparted to the knob l5 will actuate the upper 10 end of the sounding board toward or away from the front wall of the cabinet about the hinge axis 3 during which time both nut 9 and screw it will be swung bodily as required. An alternative position of obliquity both of the sounding 5 board and of the screw is indicated by broken lines in Figure 1.

Some distance from the inner end of the screw it a cotter pin it is passed therethrough for the purpose of preventing disengagement of 20 the screw from the nut 9 and incidentally to limit the falling movement of the sound recording unit about its hinge axis. Inwardly beyond the position of the cotter pin the screw H) has a smooth extremity H which passes through a slot 25 i8 formed in a depending bracket Hi, the upper end of which is appropriately fixed at 2D to the top I. Such construction serves to guide the up and down movement of the free extremity of the screw. 30

Our intention has been to provide mechanism simple and economical of manufacture for causing the sound producing instruments to assume various positions of inclination with respect to a vertical plane whereby the operator, through the agency of an additional knob i5, may bring the axis of sound emission to the angle for rendering the best audition with consideration of the elevation of the opening in the front wall with respect to the floor of the room and with consideration of the elevation in the room of listeners therein.

It is to be realized that the scope of our invention comprehends many equivalent constructions. The showing of the drawing and the particular description are merely specific exemplifications of a plurality of mechanical embodiments and arrangements.

We claim:-

1. In an appliance of the character described, the combination of a support, a sounding board articulated to one element of said support, and mechanism including a screw and nut for adjusting said board to and holding it in a plurality of selectable positions of adjustment.

2. In an appliance of the character described, the combination of a support, a sounding board hingedly mounted on said support, and carrying a nut, and mechanism for adjusting said board to and holding it in various positions of movement about its hinge axis, said mechanism including a screw cooperating with said nut and extending through said support and an operating knob on the outer end of said screw.

3. In an adjustable sound-board mounting for use in a radio cabinet, the combination of a support, a sound-board, means for movably mounting said board on said support and means for actuating said board.

4. In an adjustable sound-board mounting, the combination of a support, a sounding board, means for movably mounting said board on said support and means for adjusting said support and holding it in selectable positions.

5. In an adjustable sound-board mounting, the combination of a support, sound-board structure hingedly mounted on said support and means connected with said structure for adjusting and holding it in selectable positions of inclination with respect to said support.

6. In an adjustable sound-board mounting, the combination of a support, a sounding board hinged along one of its edges to said support and means connected with the opposite edge of said board and projecting through said support for adjusting and holding said board a plurality of positions about its hinge axis.

7. In an appliance of the character described, the combination of a support, a sounding board articulated to one element of said support, and mechanism including a screw having one end in articulated connection with said support and including a nut in articulated connection with said board for adjusting said board to and holding it in a plurality of selectable positions of adjustment. 1 :5: is; 8. In an appliance of the character described, the combination of a support, a sounding board hingedly mounted on said support, a nut hingedly connected with said board, and mechanism for adjusting said board to and holding it in various positions of movement about its hinge axis, said mechanism including a knob turnably mounted in said support and a screw hingedly connected with said knob and coacting with said nut and means for guiding the free end of said screw.

VICTOR L. KORONCAI. RUDOLPH S. KORONCAI. 

